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ASUS P3B-F User’s Manual54
4. BIOS SETUP
4. BIOS SETUP
Chip Configuration
SDRAM Configuration [By SPD]
This sets the optimal timings for items 2–4, depending on the memory mod-
ules that you are using. Default setting is [By SPD], which configures items
2–4 by reading the contents in the SPD (Serial Presence Detect) device. The
EEPROM on the memory module stores critical parameter information about
the module, such as memory type, size, speed, voltage interface, and mod-
ule banks. Configuration options: [User Define] [7ns (143MHz)] [8ns
(125MHz)] [By SPD]
SDRAM CAS Latency
This controls the latency between the SDRAM read command and the time
that the data actually becomes available. NOTE: To make changes to this
field, the SDRAM Configuration field must be set to [User Define].
SDRAM RAS to CAS Delay
This controls the latency between the SDRAM active command and the
read/write command. NOTE: To make changes to this field, the SDRAM
Configuration field must be set to [User Define].
SDRAM RAS Precharge Time
This controls the idle clocks after issuing a precharge command to the
SDRAM. NOTE: To make changes to this field, the SDRAM Configura-
tion field must be set to [User Define].
DRAM Idle Timer [10T]
This controls the amount of time in HCLKs that the DRAM controller waits
to close a DRAM page after the CPU becomes idle. Leave on default set-
ting. NOTE: To make changes to this field, the SDRAM Configuration
field must be set to [User Define]. Configuration options: [0T] [2T] [4T]
[8T] [10T] [12T] [16T] [32T] [Infinite]
4.4.1 Chip Configuration